Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75ff9ab4f0cbce4953e44747b4b8c7e6486b5126473390daad9ccb3d02d1871' 
  AND token = 'aZkVgr1bxlDZNPOJf64DkX/1IuBr08akiy9Vau6Gs1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}